%changelog sections, which contain entries that date back as far as
the middle 90's.

It is not unusual that entries, which are several years old, have become

irrelevant or wrong or get lost among several dozen entries like
"rebuilt"

or "update to x.y.z". The changelogs however are included in the rpm
packages completely and also in web pages generated from them, e.g. in
koji or repoview.
Do we have any guidelines about what to do with them and whether it
is permitted to strip the changelogs from time to time? (and if so,
whether to archive them anywhere other than in cvs?)
Not a big issue, not at all, I'm just curious. ;o)

Perhaps the approach by vim is preferable. Vim has
/usr/share/doc/vim-common-7.0.235/Changelog.rpm for older
changelog.
Mamoru

... and the last changelog you get with rpm -q --changelog points you to that
file:
- older changelogs available in Changelog.rpm
Karsten